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Explain with equation how gini impurity G i is calculated for the i t h node in a decision tree. Assume that for a given

Explain with equation how gini impurity Gi is calculated for the ith node in a decision tree. Assume that
for a given node j, there are 10 samples coming from four different classes with 2,1,3 and 4 training
instances respectively. Calculate the gini value for this node.
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